“LSD is a psychedelic drug which occasionally causes psychotic behavior in people who have NOT taken it.”

To Robert Dreyfuss in 1964, p. 6403.
Lord Meher (1986)
Context: Tell those who indulge in these drugs (LSD, marijuana, and other types) that it is harmful physically, mentally and spiritually, and that they should stop the taking of these drugs. Your duty is to tell them, regardless of whether they accept what you say, or if they ridicule or humiliate you, to boldly and bravely face these things.

Source: Fear and Loathing in Las Vegas

Deadbeat Hero (2004)

On drug use, Regis Philbin's Lifestyles (1986)

Source: LSD : My Problem Child (1980), Ch. 11 : LSD Experience and Reality
Context: The characteristic property of hallucinogens, to suspend the boundaries between the experiencing self and the outer world in an ecstatic, emotional experience, makes it possible with their help, and after suitable internal and external preparation, as it was accomplished in a perfect way at Eleusis, to evoke a mystical experience according to plan, so to speak.
Meditation is a preparation for the same goal that was aspired to and was attained in the Eleusinian Mysteries. Accordingly it seems feasible that in the future, with the help of LSD, the mystical vision, crowning meditation, could be made accessible to an increasing number of practitioners of meditation
I see the true importance of LSD in the possibility of providing material aid to meditation aimed at the mystical experience of a deeper, comprehensive reality. Such a use accords entirely with the essence and working character of LSD as a sacred drug.

Chaos and Cyber Culture (1994)

Foreword
LSD : My Problem Child (1980)
Context: Deliberate provocation of mystical experience, particularly by LSD and related hallucinogens, in contrast to spontaneous visionary experiences, entails dangers that must not be underestimated. Practitioners must take into account the peculiar effects of these substances, namely their ability to influence our consciousness, the innermost essence of our being. The history of LSD to date amply demonstrates the catastrophic consequences that can ensue when its profound effect is misjudged and the substance is mistaken for a pleasure drug. Special internal and external advance preparations are required; with them, an LSD experiment can become a meaningful experience. Wrong and inappropriate use has caused LSD to become my problem child.

LSD psychotherapy (1980), MAPS 2001 edition, Epilogue, p. 300.

Radio From Hell (May 24, 2006)